A point represents an infinitesimally small area in space. In the case of a line graph, and assuming the point is on the line, it represents the exact value of the linear function of x, f(x) or y, at any given value of x. The important thing to remember is that when you actually draw a dot on a graph representing a point, you're really representing an object with no dimensions.
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A straight line.
The curved line on a time vs. distance graph represents that the object is accelerating.
It represents all solutions to the linear equation.
The slope of a line on a position vs. time graph would represent the a velocity of the object being described.
Yes, x = -3 would represent a vertical line at abscissa -3, parallel to the y-axis.